Edge ECMP topology

In VMware NSX-T Data Center for VxBlock Systems, ECMP provides load-balancing across multiple paths northbound from the Tier-0s to the Cisco Nexus 9000 Series ToR switches. VMware NSX-T Data Center supports a maximum of eight paths per edge node cluster.

Each Tier-0 gateway peers with each of the two ToR Cisco Nexus 9000 Series Switches. As a result, the maximum number of edge node VMs in the cluster is four.

The following figure shows a minimum edge cluster configuration with two edge node VMs peering with the ToR switches, consuming four ECMP paths:

The following figure shows a maximum edge node cluster configuration with four edge node VMs peering with the ToR switches, consuming eight ECMP paths:

This design peers each edge node with each ToR switch.